Speed changing and reversing mechanism.



PARKER. SPEED CHANGING AND REVERSING MECHANISM.

APPLICATION FILED JULY 3h19l2.

1,170,097. Patented Feb. 1, 1916;

3 SHEETSSHEET I.

U/Ltn'esses Inventor APPLICATION FILED JULY 31 I9I2.

Patented Feb. 1, 1916.-

3 SHEETSSHEET 2.

Attorney J. PARKER.

SPEED CHANGING AND REVERSING MECHANISM.

APPLICATION FILED lULY 31,1912.

Patented Feb. 1, 1916.

3 SHEETSSHEET 3- Invent-or plm) wzt-nesses JOHN PARKER, OF PROVIDENCE,

MANUFACTURING COMPANY, 01 PROVID RHODE ISLAND.

RHODE ISLAND, ASSIGNOR TO BROWN & SHARPE ENCE, RHODE ISLAND, ACORPORATION 0! SPEED CHANGING AND BEVEBSING MECHANISM.

Specification of Letters Patent.

Patented Feb. 1, 1916.

Application filed July 81, 1912. Serial No. 712,392.

To all whom it may concern:

Be it known that I, JonN PARKER, of the city and county of Providenceand State of Rhode Island, have invented certain new and usefulImprovements in Speed Chan ing and Reversing Mechanism; and I o herebydeclare the following specification, taken in connection with theaccompanying drawings, forming a part of the same, to be a full, clear,and exact description thereof.

The present invention relates to a speedchanging mechanism and has forits ob ect to provide such speed-changing mechanism with means forreversing the direction of rotation of the driven member.

A' further object of the invention is to provide'means whereby thedriven member may be rotatedin the reverse direction at differentspeeds.

. The invention consists primarily in the combination, with driving anddriven members of a speed-chang ng mechanism, of a wlth said driving anddriven members, whereby said driven member may be rotated in a reversedirection.

The invention further consists in the combination, with driving anddriven members of a speed changing mechanism, of a'gear movable into andout of engagement with said driving and driven members, and means I forcontrolling the positionof said gear.

The invention further consists in the combination, with engaging drivingand drlven members of a speed changing mechanism, of means fordisengaging said members, and a gear adapted to be moved into and out ofengagement with said driving and drlven members when said members aredisengaged from each other.

The invention further consists in the combination, with driving anddriven members of a speed changing mechanism, gears, each movable intoand out of on agement with said driving and driven mem ers,

whereby said driven member may be rotated in a reverse direction at acorrespondingly greater number of speeds.

ear movable into and out of engagement.

of. two

The invention further consists in the construction, arrangement, andcombinations of parts hereinafter described and claimed.

Referring now to the drawings, Figure 1 is a side elevation of a portionof a milling machine embodying the invention. Fig. 2 is a horizontalsection through the spindle of the machine. Fig. 3 is a vertical sectionon the line 3-3 of Fig. 1. Fig. 4 is a transverse section on the line Hof Fig. 3, but

' on a larger scale. Fig. 5 is a vertical section on the line 5-5 ofFig. 4. Fig. 6 is a vertical section on the line 66 of Fig. 5. Fig. 7shows the gear connections for the for- Ward rotation. Fig. 8 shows thegear connections for the reverse rotation.

In the drawings the invention is shown as applied to a milling machine,but it will be understood that the invention is applicable in connectionwith any driven shaft where it is desired to change the speed of saidshaft and also to reverse the direction of rotation thereof.

. The speed changing mechanism in connection with which the presentinvention is shown in the drawings as being employed is fully shown anddescribed in Letters Patent, No. 855,068, dated May 28, 1907, granted tome, and such speed-changing mechanism therefore need be only brieflydescribed, in this connection.

The speed changing mechanism comprises an elongated gear or pinion7, acone-gear 8, which in the construction shown constitutes the drivingmember hereinbefore referred to,-a.ud a tumbler gear 9 arranged to beshifted along its shaft 10, and so that said tumbler gear may be broughtinto engagement with any one of the gears of the cone-gear. A fork 11engages the tumbler gear for shifting the same along its shaft. Byshifting the tumbler gear to bring the same in'alinement with one or theother of the gears of the cone-gear, and swinging the tumbler gear intoengagement with the gear of the cone-gear with which it has thus beenbrought into alinement, the speed of the spindle 12 will becorrespondingly changed or varied.

' which may be obtained for the spindle, such means comprising aquill-gear 13 splined to the spindle 12, through which quill-gearrotation is imparted to the spindle. In the construction shown saidquill-gear 13 consti-- tutes the driven member hereinbefore referred to.The small gear 14 of the quillgear is adapted to be brought intoengagement with the largest gear 14- of the conegear, and the large gear15 of the quill-gear is adapted to be brought into engagement with nextto the smallest gear 15 of the cone-gear, the quill-gear being slidableon the spindle to bring one or the other of said gears into engagement.When the quillgear is moved to a position in which the large gear 15 isin alinement with the smallest gear 15 of, the cone-gear, there will beno'engagement between said gears, and as at this time the gear 14 of thequill-gear will have been moved out of line with the largest gear 14: ofthe cone-gear, there will be no engagement between the quill-gear andthe cone-gear, the quill-gear being at this time in what may be termed aneutral position, as shown in' Fig. 8.

A shaft 16 is provided at its inner end with a pinion 17 which engages arack 18 formed on the hub of the quill-gear. Said shaft 16 is providedat its outer end with an operating arm 19, by means of which said shaftmay be turned in one direction or the other toshift the position of thequill-gear. The operating arm 19 is preferably provided with aspring-pressed pin 20 adapted to engage one or the other of two holes21, according to which of the gears 14, 15 is brought into engagementwith the conegear. By the employment of said quill-gear the spindle maybe driven at either of two speeds for each speed of the cone-gear, and

so that said spindle may thus be driven at any one of eight differentspeeds with four gears in the cone-gear, as shown in the drawings. Ahole .22 is provided, which is adapted to be engaged by thespring-pressed pin 20 when the quill-gear is shifted to its neutralposition.

When the quill-gear is in its neutral position, and so that there is nodirect engagement between the quill-gear and the conegear, it is evidentthat if an intermediate gear be brought into engagement with saidcone-gear and said quill-gear, thereby forming an indirect connectionbetween said gears, the direction of rotation of the quillgear, andconsequently of the spindle, will be reversed as compared with thedirection of rotation when there is a direct connection between thecone-gear and the quill-gear. As shown in the drawings, such anintermediate gear is provided, together with means for moving the sameinto and out of engagement with both the cone-gear and the quillgear,and so as thus to make connection between the cone-gear and thequill-gear through such intermediate gear. By providing two. suchintermediate gears, one adapted-to be brought into engagement with thegear 14 of the quill-gear and the other to be brought into engagementwith the gear 15 of the quill-gear, it is evident that the number ofreverse speeds will be thereby doubled, and so that with four gears inthe cone-gear eight reverse speeds will be obtained, being thus the samenumber as in the case of the forward speeds. t The elongated gear 7,cone-gear 8, and tumbler-gear 9 and their shafts ,are all mounted in abox or casing 23 adapted to be inserted through an opening in the sidewall of the frame of the machine,-said'casing bein connection with thefront wall of the casing itself constitute a cover-plate 23 for saidopening. Extending inwardly from said cover-plate are guides 24:, 24, 24provided with suitable guide-ways on which are mounted two carriages 25,26, said carriages being adapted to slide forward. and back upon saidguide-ways. Secured in the carriage 25 is a shaft 27 upon which isloosely mounted a gear 28, and secured in the carriage 2G is a shaft 29upon which is loosely mounted a gear 30. The gear 28 is adapted to bemoved into and out of engagement with the small gear 11 of thequill-gear and the gear 14 of the cone-gear, while the gear 30 isadapted to be moved into and out of engagement with the large gear 15 ofthe quill-gear and gear 15 of the cone-gear. The means for thus movingsaid gears 28 and 30 into and out of engagement with the quill-gear andcone-gear in the construction shown are as follows: Secured to thecarriage 25 and extending outward therefrom is a screw 31. and securedto the carriage 26 ,is a corresponding screw 32, the screw 31 in theconstruction shown being a left hant screw and the screw 32 a right handscrew; Mounted in the cover-plate 23, andso as to be capable of rotationtherein are two nuts 33 and 31, the nut 33 being arranged to engage thescrew 31 and the nut 34 to engage the screw 32. The nut 33 is held inplace in the cover-plate by an annular ring-35 secured to saidcover-plate, and the nut 31 is likewise held in place in the cover-plateby a corresponding annular ring 36. The outer end of the nut 33 isprovided with gearteeth to form a gear 37, while the outer end of thenut 34 is provided with a similar gear 38. Intermediate the gears 37 and38 and engaging both of the said gears is a gear operating arm 41. Saidarm 41 is preferably provided with a spring-pressed pin 42 The operationof the mechanism above described is as follows: Assuming the gear 14 ofthe quill-gear to be in engagement with the gear 14 of the cone-gear forthe forward rotation of the spindle, as shown in Fig. 7, the operatingarm 19 will be in the position shown in Fig. 1. When now it is desiredto rotate said spindle in the reverse direction the operating arm 19 .ismoved intoposition where its pin will enter the hole 22, which willserve to move the quillgear into neutral position, thereby breaking theengagement between said quill-gear and the cone-gear by means of whichthe spindle has been rotated in the forward direction.

The operating arm 41 is then moved in one direction or the other,according to WhlCh of the two gears 28, 30, it'is desired to bring intoengagement with the quill-gear and the cone-gear. Assuming that it isthe gear 28 which is to be thus moved into engagement with thequill-gear and cone-gear, the operating arm 41 will be moved from theposition shown in Fig. 1 around to a position where the spring-pressedpin 42 will engage the hole 43. If, on the other hand, it be desired tomove the gear 30 into engagement with the quill-gear and the cone-gear,then the operating arm 41 will be moved from the position shown in Fig.1 in the opposite direction and around to a position where thespring-pressed pin 42 will engage the hole 44.

As will be seen, with the construction shown, when the operating arm 41is turned in a direction to move the gear 28 inward,

, the gear 30 will, through the gearconnections, be moved outward, andvice versa, and" that when the operating arm 41 is moved to the positionshown in Fig. 1 both gears 28, 30 will be moved to mid-position and thusout of engagement with-the quill-gear and cone-gear.

As will be evident, when the gear 28 is moved inward toengage the smallgear 14 of the quill-gear and the largest gear of the cone-gear, one setof reverse speeds will .be

provided for, while when the gear 30 is' moved into engagement with thelarge gear 15 of the quill-gear and next to the smallest gear of thecone-gear, another set of reverse speeds will be provided for. It willbe further seen that each of the 'tWo gears 28 and 30 has a width offace equalto thatof two gearson the cone, as shownv in Fig. 8, and sothat, notwithstanding that when the quillgear is moved to neutralposition the gear 14 is out of line with the largest gear of thecone-gear, the gear 28 will nevertheless make I connection between saidgears, and so that while the gear 15' is to be connected, not with thesmallest gear of the cone-gear, but with I the next to the smallestgear, the gear 30 .said cone-gear, or in other words, it is importantthat the gear 28 or the gear 30 shall not be moved inward to connect thequill gear and the cone-gear until it is certain that the quill-gear hasbeen moved to neutral position and the direct connection between thequill-gear and the coneear thus broken. Means are therefore provi ed forinsuring be moved inwardto make connection between the quill-gear andthe cone-gear until the quill-gear has been moved to its neutralposition.

The carriage 25 is provided with a hole 45 and the carriage 26 isprovided with acorresponding hole 46. The casing 23 isprovided with aboss or projection 47 in which are mounted to reciprocate two lockingpins 48 and 49. The pin 48 is provided with a rack 50 and the pin 49with a rack 51, both of which racks are engaged by an intermediatepinion 52 secured to or formed on the shaft 16.

With this construction when the operating arm 19 is in the positionshown in Fig. 1, with the spring-pressed pin 20 in engagement with oneof the holes 21, the quill-gear is in one of the positions in which itis in direct engagement with the cone-gear, and both of the carriages'25 and 26 are in their mid when the operating arm 19 is moved to theopposite position, and so as to bring the spring-pressed pin 20 intoengagement with the other hole 21, the shaft 16 and the pinion 52 willbe turned and so that thereby the locking pin-48 will be raised and thelocking pin 49 will be depressed and caused to enter the hole 46 in thecarriage 26, thereby likewise locking both carriages in theirmid-position. If now it be desired to reverse the rotation of thespindle 12. the first thing to be done is to shift the quill-gear to itsneutral position. This is efietted by moving the operating arm 19 to aposition where the spring-pressed pin 20 will engage the hole 22. Thismovement of the arm 19 will impart a rotation to the shaft .16suflicient to withdraw the locking pin which at the time was inengagement,

80 that neither the gear 28 nor the gear 30 shall and will be such as toleave both locking pins out of engagement with the respective carriages25 and 26, and so that said carriages may thus be moved to bring one orthe other of the gears 28 or 30 into engagement with the quill-gear andthe cone-gear.

By the Construction above described, as will be seen, the carriages 25and 26 will be locked in mid-position, and the gears 28 and 30 be thuslocked in position out of en gagement with the quill-gear and theconegear, so long as the quill-gear is in direct engagement with saidcone-gear, and neither of the gears 28 or 30 can be moved into engagingposition until the quill-gear has been moved out of engagement with thecone-gear and into its neutral position. It

is likewise important that the quill-gear should not be thrown intodirect engagement with the cone-gear so long as either of the reversegears 28 or 30 is in engagement with said quill-gear and said cone-gear,and by the construction above described means are provided whereby thequill-gear will be prevented from being moved into engagement with thecone-gear so long as either the'gear 28. or the gear 30 is in engagementtherewith. When either the gear 28 or the gear 30 is in engagement withthe quill-gear and the cone-gear, the quill-gear being at this time outof direct engagement with the cone-gear, one of the carriages 25, 26will be in its inner position while the other carriage will be in itsouter position. While at this time both of the locking pins 48, 4.9 willbe withdrawn from engagement with their respective carriages, theends ofboth pins will be bearing upon or be in close proximity to the uppersurface of its carriage, .as shown in Fig. 5. In order to move thequill-gear from its neutral position into a position to directly engagethe cone-gear, it is necessary to turn the shaft 16, but so long aseither one of the gears 28 or 30 is in engaging position the shaft 16cannot be turned. because the abutting of the ends of the locking pins48, i9 against their respective carriages 25 and 26 will prevent theturning of said shaft in either direction, and thus prevent the movementof the quill-gear into engaging position. Thus with the constructionabove described both the quill-gear on the one hand and the reversegears on the other hand are each in turn locked in their disengagingpositions, and so that neither the quill-gear nor either of the reversegears can be moved into engaging position until the other has beendisengaged, thereby safe-guarding against either gear being prematurelymoved into engaging position and preventing the possibility of injurywhich might in such case result.

WVhat I claim as my invention and desire to secure by Letters Patent is:I

1. A speed-changing and reversing mechreverse direction at one or theother of two diflerent speeds.

2. A speed changmg and reversing mechanism comprising a cone-geardriving member and a quill-gear driven member adapted to be engaged onewith the other to rotate said quill-gear in one direction, and twointermediate gears adapted to be alternately moved into engagement withsaid cone-gear and said quill-gear to rotate said quill-gear in thereverse direction at one or the other of two different speeds.

3. A speed-changing and reversing mechanism comprising a cone-geardriving member and a quill-gear driven member, means for moving saidquill-gear into engagement with said cone-gear to enable said quill-gearto be rotated by said cone-gear, two interme diate gears, and means formoving either one of said intermediate gears into engagement with saidcone-gear and said quillgear to rotate said quill-gearin the reversedirection at one or the other of two different speeds. I

4. A speed-changing and reversing mechanism comprising a driving gear, acone gear, a tumbler-gear adapted to engage said driving gear and saidcone-gear, a quill-gear adapted to engage said cone-gear, and anintermediate gear adapted to engage said cone-gear and said quill-gearto rotate said quill-gear in the reverse direction.

5. A speed-changing andreversing mechanism comprising a driving gear, aconegear, a tumbler-gear adapted to engage said driving gear and saidcone-gear, a quill-gear adapted to engage said cone-gear, and twovintermediate gears adapted to engage alternately said cone-gear and saidquill-gear to rotate said quill-gear in the reverse direction at oneorwthe other of two different speeds.

6. A speed-changing and reversing mechanism comprising a driving gear, aconegear, a tumbler-gear, means for moving said tumbler-gear into andout of engagement with said driving gear and said cone-gear, a quillgear, means for moving said quillgear into and out of engagement withsaid a quill gear, means for moving said quillgear into and out ofengagement with said cone-gear, two intermediate gears, and means formoving said gears alternately into and out of engagement with saidcone-gear and said quill-gear.

8. A speedchanging and reversing mechanism comprising a driving memberand a driven member, means for moving said driven member into engagementwith said driving member, two carriages, a gear "mounted on each of saidcarriages, and

means for reciprocating said carriages to move said gears into and outof engagement with said driving and driven members.

9. A speed-changing and reversing mechanism comprising a cone-gear, aquill-gear, means for moving sald quill-gear 1nto enbers the othercarriage will be moved away therefrom. a

.11. A speed-changing and reversing mechanism comprising a drivingmember and a driven member, two carriages, a gear mounted on each ofsaid carriages, means for moving both of said carriages to midpositionand for moving one of said carriages from said mid-position toward saiddriving and driven members and for moving the other carriage awaytherefrom.

12. A speed-changing and reversing mechanism comprising a driving memberand a driven member, one of said members being shiftable with relationto the other,

two gears movable into and out of engage- 60 ment with saiddriving anddriven members,

. and means controlled by the shifting of the shiftable member forlocking both of said movable gears out of'engagement.

13. A speed-changing and reversing mechanism comprising a quill-gear anda cone-gear, means for shifting the position of said quill-gear withrelation to said conegear, two gears movable into and out of engagementwith said quill-gear and said conegear, and, means controlled by theshifting of said quill-gear for locking both of said movable gears outof engagement.

14.. A speedchanging and reversing mechanism comprising a quill-gear anda cone-gear, means for shifting the position of said quill-gear withrelation to said conegear, two carriages, a gear mounted on each of saidcarriages and adapted to be brought into engagement with said quill-gearand said cone-gear, operative connections between said carriages, andmeans controlled by the shifting of said quill-gear for locking saidcarriages in position where both of said movable gears will be out of.engagement.

15. A. speed-changing and reversing mechanism comprising a drivingmember and a driven member, one of said members being shiftable withrelation to the other, two gears movable into and out of engagement.with said shiftable member, and means controlled by said movable gearsfor preventing the shifting of said shiftable member when either of saidmovable gears is in engagement therewith.

16 A speed-changing. and reversing mechanism comprising a cone-gear" anda quill-gear, one of said gears being shiftable with relation to theother, two gears movable into and out of engagement with said shiftablegear, and means controlled by said movable gears for preventing theshifting of said shiftable gear when either ofsaid movable gears is inengagement therewith.

17. A speed-changing 'and reversing mechanism comprismg a drivingmember.

and a driven member, one of said members being shiftable with.relation'to the other two carriages, a gear mounted on each of saidcarriages, and means controlled by said carriages for preventing theshifting of said shiftable gear when either of said movable gears is inengagement therewith.

18. A speed-changing and reversing mechanism comprismg a driving memberand a driven member, one of said members being shiftable withrelation tothe other, a gear movable into and out of engagement with said shiftablemember, a shaft forshifting said shiftable member, and means operated bysaid shaft for locking said movable gear out of engagement when saiddriving and driven members are in engagement with each other. a

19. A speedchanging and reversing mechanism comprising a driving memberand a driven member, one of said members being shiftable with relationto the other, a gear movable into and out of engagement with saidshiftable member, a shaft for shifting said 'shiftable member, and meansoperated by said shaft for holding said shiftable member againstmovement when said movable gear is in engagement therewith. v

20. A speed-changing and reversing mechanism comprising a driving gearand a driven gear, one of said gears being shiftable with relation tothe other, two gears movable into and out of engagement with saidshiftable gear, a shaft for shifting said when either of said movablegears is in em shiftable gear, means operated by said shaft gagementtherewith. for locking said movable gears out of engagement When saiddriving and driven 5 gears are in engagement with each other, Witnesses:

' and means operated by said shaft for hold- W. H. THURSTON,

JOHN PARKER.

'ing said shiftable gear against movement J. H. THURSTON.

